Mechanical Properties of C/SiC/Si-Mo-Cr Multilayer Coated Carbon/carbon Composites

doi:10.3724/SP.J.1077.2008.00725

Abstract

Abstract: A novel C/SiC/Si-Mo-Cr multilayer oxidation protective coating for carbon/carbon composites was prepared by pack cementation and slurry method. The microstructures of the as-prepared multilayer coating were characterized by XRD and SEM analyses. The effects of the coating processing and thermal shock on the mechanical properties of carbon/carbon composites were investigated by three point bending tests. The results show that the asobtained multiphase coating is dense, and the flexural strength of carbon/carbon composites after coating increases and the fracture behavior changes from the pseudoplastic fracture to brittle fracture mode. After enduring the thermal cycling between 1500℃ and room temperature for 20 cycles, the flexural strength of the coated specimens decreases accordingly, and the plastic increases.

Key words: carbon/carbon composites, oxidation protective coating, mechanical property

CLC Number:

TB332

ZHANG Yu-Lei,LI He-Jun,YAO Xi-Yuan,FU Qian-Gang,LI Ke-Zhi. Mechanical Properties of C/SiC/Si-Mo-Cr Multilayer Coated Carbon/carbon Composites[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2008.00725.

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Mechanical Properties of C/SiC/Si-Mo-Cr Multilayer Coated Carbon/carbon Composites

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